pH is a measure of the amount of Hydrogen ion in a solution. In pure water ions tend to form due to random processes by producing some H and OH ions. The amount of H ion that is made in pure water is about equal to a pH of 7. That's why pH 7 is neutral.

Well,

Because the concentration of hydrogen ion (H+) and also the concentration of hydroxyl ion (OH-) is about (0.0000015-0.00000015) moles/liter, means pH values of (6.5) to (7.5) as shown in the attached figure.

Sincerely

Hi, Phani, this is the the result of Reduction-Oxidation Processes in microbial communities. This pH is the most acceptable (pH 7), because the interior of cells is approximately neutral in pH. The H2-producing and the H2-consuming bacteria tend to grow in close proximity to each other, thereby facilitating the diffusional transfer of H2 at low concentration from one organism to the other, a so-called ‘inter-species hydrogen transfer’ (Conrad et al. 1986; Schink 1997). For global role of microorganisms in geochemistry look, please, works of ukrainian academician Vernadskiy.

I hope that Chapter 5 Bacteria and Marine Biogeochemistry of perfect book

Marine Geochemistry will be useful.

Andrey

Great class!

Many thanks to the masters.

Regards!

For the pH to be near 7 (near neutral/pure water), it means that hydrogen ion concentration in water is about that of the pH of 7. In the surface water, there are certain microbial and photo-chemical reactions caused by cellular and micro organisms that bring about redox reactions, and the consequent inter transfer of controlled amount of hydrogen ion among the species in their microbial loads. The essence of these reactions is to make this water favourable for these organisms.

Great thanks to everybody for valuable contribution.